CN1344431A - High-pass filter - Google Patents
High-pass filter Download PDFInfo
- Publication number
- CN1344431A CN1344431A CN00805157A CN00805157A CN1344431A CN 1344431 A CN1344431 A CN 1344431A CN 00805157 A CN00805157 A CN 00805157A CN 00805157 A CN00805157 A CN 00805157A CN 1344431 A CN1344431 A CN 1344431A
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- China
- Prior art keywords
- pass filter
- high pass
- filter
- frequency
- electronic circuit
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/075—Ladder networks, e.g. electric wave filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/09—Filters comprising mutual inductance
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Transceivers (AREA)
- Filters And Equalizers (AREA)
- Emergency Protection Circuit Devices (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The invention relates to an electric filter for filtering low frequencies in order to protect an electronic circuit from ESD. A high-pass filter (1) for filtering low frequencies is used in the signal path between an antenna connector (2) and an electrical circuit (3) in a communication unit. Via the antenna connector different antennas may be connected. The high-pass filter (1) for filtering low frequencies is erected with a capacitance (C1) in the serial path and a inductance (L1) in the parallel path. The high-pass filter (1) allows the protection of the following electrical circuit (3). As a further aspect the high-pass filter has a cutoff frequency lower than the lowest cutoff frequency of a radio frequency separator in the electrical circuit (3).
Description
High pass filter
The present invention relates to a kind of electrical filter of filtering low frequency, be used for protective circuit, make it avoid the impact of high-voltage pulse.The invention still further relates to the circuit in the communication unit is protected.
We are known, how to create a communication unit in prior art, for example are the mobile phones that has one first main antenna connector and be used for another antenna connector of an additional additional antenna.Usually, first and main antenna provide with phone, and most of time is what keep to connect.Another antenna for example is an exterior antenna used in automotive environment, usually not attached on the phone, only under the situation that resembles this special applications that drives a car, just can be connected with communication unit.But antenna connector is loading and unloading easily, so that can be connected fast with another antenna.Therefore, by additional antenna connector, antenna was screwed into, antenna is filled in, and be located at the outer surface (" the 0riginalzubeh r:Erh hen sieden Nutzen Ihres Ericsson Mobiltelefons " that announced by Ericsson 1997) of communication unit.
Antenna connector on the outer surface is a kind of interface, and it is the not influence of the high-voltage pulse resembled the Electrostatic Discharge extremely.ESD can reduce the sensitivity of receiver, and may reduce power output.In addition, ESD also might make the element in the communication unit damage.
In addition, increasing so-called DFS double frequency shift mobile phone is available on market.For example, a DFS double frequency shift mobile phone can be worked on two kinds of different frequencies.For example be to be operated in 900MHz and 1800MHz, or be operated in 900MHz and 1900MHz.Because the use of SAW (Surface Acoustic Wave) filter, make at the low-frequency band receiver simultaneously in the field of high frequency band receiver, the identical problem of foregoing relevant ESD might take place.
For reducing sensitivity, in signal path, added non-linear element to ESD.Non-linear element can be a diode or variable capacitance diode or discharger.
Add non-linear element and can in transmitter path, produce harmonic wave.The big deviation of the actual value of these electric capacity, inductance and resistance can cause the change of loss, thereby has changed the sensitivity of receiver.
In addition, any additional element also can cause additional loss, and reduces the sensitivity and the power output of receiver.The generation of supplementary load loss is the power consumptions that cause owing to the limited Q factor of element, or because the mismatch that these elements are introduced.
Therefore, an object of the present invention is to provide a kind of electrical filter, it need not provide extra loss and produce any harmonic wave and just can reduce static discharge sensitivity.
This is that guidance by claim 1 realizes.
According to claim 1, very advantageously be, a kind of ESD protection is provided, be used for low-frequency band, be used for any other frequency between high frequency band or this two frequency bands.
In addition, also very advantageously be both can also can synthesize this electrical filter with discrete parts with integrated component.
Also having an advantage is exactly that this electrical filter that is used for the ESD protection is easy to realize, and protects without any need for other the device resemble the mechanical device.Thus, another convenience of generation is, the user, for example the mobile phone user does not need to handle in person this protection, this be because, do not need user's any other operation to protective device, it just can have been worked.
Other advantageous embodiments all is included among the claim 2-21.
According to claim 15, owing to discrete parts can be placed near on the position of antenna connector, this is favourable.This can protect electronic circuit not to be subjected to the evil of high-voltage pulse more.
According to claim 16 and 17, use single multi-layer part highly beneficial, this is because the high pass filter or the thin-film component that are integrated in the multilayer circuit can mate with low pass filter branch road and high pass filter branch road respectively.Therefore, owing to the finite element value makes the constraint that designs has been reduced.In addition, under the situation of using same material to make, identical temperature and variations in temperature can betide all elements.
Below, will by way of example, the present invention be further detailed according to accompanying drawing.The following drawings demonstrates:
Fig. 1 a: comprise the schematic block diagram of claim 1,
Fig. 1 b: the semi-schematic block diagram of the signal path of DFS double frequency shift mobile phone,
Fig. 2: illustrate characteristic performance curve of output V2 and V3 from diplexer,
Fig. 3 a: the standardization esd pulse of being simulated,
Fig. 3 b: the standardization esd pulse of being simulated, and resulting impulse response on the output of diplexer used in the present invention,
Fig. 4: the second semi-schematic block diagram of DFS double frequency shift mobile phone signal path.
Appear in the different accompanying drawings resemble parts and the such element with same numeral of port refers to identity element.
Below will be further detailed the present invention by Fig. 1 a and Fig. 1 b.
An antenna connector 2 that is used to connect an antenna and an electronic circuit 3 is connected by a signal path.Antenna connector 2 links to each other with signal path by port one 1, and antenna connector both can be used to connect an independent antenna, equally also can be used for connecting an inside antenna and an exterior antenna.Being connected with an inside antenna and an exterior antenna and needing to use under their situation, need an additional antenna switch SW of between inside antenna and exterior antenna, switching.This has shown in Fig. 1 b, and wherein duplexer SW is the part of antenna connector 2.Also provide another port one 2, so that electronic circuit 3 is connected on the signal path.
In addition, Fig. 1 b has shown the semi-schematic block diagram, and wherein, in a preferred embodiment, the top parts of the electronic circuit 3 that links to each other with signal path by port one 2 are diplexers 30.Here, as shown in the figure, typical diplexer 30 is equipped with a low pass filter branch road 31 and a high pass filter branch road 32, the former is used for, for example, separate the 900MHz frequency band, it has corresponding output port 3, and the latter is used to separate the frequency band of 1800MHz, and it has corresponding output port 2.Because in prior art, the diplexer device is well-known, thereby the diplexer device of selected demonstration only is used to illustrate.The special construction of diplexer 30 is described in specification " Dual band (GSM-DCS 1800) Chip Multilayer Frequency Separator SLF-090ENfrom Hitachi Metals, Ltd., Tottori Works ".
But, need point out once more, to of the selection of diplexer device, can't limit the scope of the invention as electronic circuit.But, equally also can use triplexer or any similar installation here.The present invention can be used for any situation about drawing of imagining, described situation refers to must the protection electronic circuit, makes it avoid situation from the high-voltage pulse of antenna connector.
In addition, a high pass filter can be used for electronic circuit 3, here, element up front is a single band separator or a n band separator, and wherein n represents 1,2,3 ... doubly the frequency band that uses resembles GSM 900 and has the bandwidth of 890MHz to 960MHz, or GSM 1800 has the bandwidth of 1710MHz to 1880MHz, or PCS 1900 has the bandwidth of 1850MHz to 1990MHz.In addition, also can be used in combination aforementioned means, here, top element in the electronic circuit is a kind of monotype or n mode splitter, and wherein n represents 1,2,3 ... use pattern doubly for example is GSM, AMPS, IS-95, DECT, satellite phone or UMTS.The top element that should be pointed out that this electronic circuit can be any switch matrix, resembles transmit/receive switch, or is used for any transmitter or receiver circuit that radiofrequency signal is handled.
A kind of possible way of realization of the present invention is to be used in the PC environment, wherein is inserted with the such card form phone of card form phone that resembles PCMCIA, and the card form phone uses above-mentioned any different pattern or standard.
Shown in Fig. 1 b, in a preferred embodiment, the electrical filter that is used for esd protection is a high pass filter, and it is made of the first capacitor C1 and the first inductor L1.Capacitor C 1 is connected in series with signal path, and provides the direct current decoupling between community antenna tie point 11 and electronic circuit port one 2.Inductor L1 is connected between common signal path and the ground, and plays a major role in esd protection.The input esd pulse at first at the C1 place by differential, afterwards, by L1 with its shorted to earth.The energy that is shorted to ground extremely relies on inductance rate and the factor Q of L1.Therefore, need carry out meticulous design,, provide minimum may inserting simultaneously so that esd pulse is reduced to not dangerous level to C1 and L1.Certainly, the high pass that is made of C1 and L1 is very simple high pass filter, also can realize high pass characteristic with additional capacitors, inductance or resistance, and improves the ESD protection.In addition, series connection here and alternate path provide extra line loss, and it is a feature with resistance or any parasitic capacitance or inductance.Whenever can substitute electric capacity or inductance, to obtain a high pass filter characteristic with resistance R.
As previously mentioned, according to a preferred embodiment, the top element of the electronic circuit 2 in the DFS double frequency shift mobile phone is diplexers 30.Both can realize diplexer 30 with discrete parts, also can be with it as an independent multi-layer part or as a thin-film device.This means that this diplexer 30 is unit, it comprises all essential elements, and realize this unit with same material, equally, in the specification of " Dual band (GSM-DCS 1800) Chip Multilayer Frequency Separator SLF-090ENfrom Hitachi Metals; Ltd., Tottori Works ", for example understand above-mentioned situation.
Another aspect of the present invention is: can comprise a high pass filter 1 in this diplexer 30.Equally also can be with realizing all elements of high pass filter 1 with element identical materials from diplexer 30, this also can bring other benefit.In fact, high pass filter 1 and diplexer 3 can be counted as have input port, a new unit of output port 2 and port 3.An advantage of this new unit is no longer to need discrete parts to realize.
But, equally also can use the combination of discrete parts and multi-layer part, and they can be used to realize high pass filter.This point for example can be realized by following manner, is a kind of discrete parts from the electric capacity of IEEE Std serial highway, and is to realize in the multi-layer part of diplexer below from the inductance of IEEE Std parallel highway, but all other combinations also can be imagined and obtain.
Another aspect of the present invention is: the element of high pass filter might be fixed in the unit with the multi-layer part that resembles switch matrix, for example in the transmit/receive switch of being made by the GaAs material.
In a preferred embodiment, when realizing high pass filter 1, C1 has used the capacitance of 6.8pF, and L1 has used the inductance value of 0.015 μ H.Equally, also used the technical development state of the present diplexer 30 described in the specification of " Dual band (GSM-DCS 1800) Chip Multilayer Frequency Separator SLF-090ENfrom Hitachi Metals; Ltd., Tottori Wotks ".But, should be pointed out that selected value only is used for for example, what provide only is a kind of possible selection to value.
Below, will further specify the present invention by Fig. 2.
Fig. 2 has shown from the port 2 in the device of the explanation formerly shown in Fig. 1 b and the characteristic performance curve of output of port 3.X-axis has shown to be the frequency that unit is measured with the hertz, and the y axle is represented voltage VOUT.Finally, in Fig. 2, can see two curves, wherein V2_dB represents the voltage of the output port 2 of high pass filter branch road, and V3_dB represents the voltage of the output port 3 of low pass filter branch road.According to the present invention, the cut-off frequency of the high pass filter 1 that is added is 498MHz.The cut-off frequency of the high pass filter recently low-limit frequency from two diplexer branch roads is low.This means that the cut-off frequency of additional high pass filter 1 is big more with distance between the cut-off frequency of diplexer 30, then high pass filter is more little to the decay of the influence of diplexer and reality.
In the example of aforementioned selection, decay is lower than 0,3dB.
In another preferred embodiment of foundation Fig. 4, high pass filter is used for and the transmit/receive switch use that combines, as the top parts of the electronic circuit in the GSM 900/1800 DFS double frequency shift mobile phone.Here, when realizing high pass filter 1, C1 has used the capacitance of 22pF, and L1 has used the inductance value of 0.1 μ H, and the additional C2 in IEEE Std serial highway has used the capacitance of 22pF.Having shown among Fig. 4 from this high pass filter in the signal path of antenna connector 21 and the top parts of electronic circuit, here is transmit/receive switch 4, combined situation.
In following Fig. 3 a and 3b, the x axle represents with the second to be the time of unit, and the y axle is represented the voltage VOUT of different port.In addition, the voltage of numbering v (1) expression port one, shown as previous drawings, v (2) and v (3) represent the voltage of port 2 and 3 respectively.
In Fig. 3 a, shown the similar standardization esd pulse of the signal output waveform to the ESD generator of being simulated.At international standard IEC 61000-4-2, describe the waveform characteristic of this standardization esd pulse among the 1995-01 in detail.Fig. 3 b has shown the improvement to esd protection, and it can be realized with previous selected structure.Under the situation of the diplexer 30 with previously mentioned set-point, esd pulse is propagated by the low pass filter branch road 31 of diplexer 30, and almost not decay.Esd pulse by high pass filter branch road 32 is reduced to about 2/5.In these cases, it is about 1/8 that the esd pulse by low pass filter branch road 31 is reduced to, and the esd pulse by high pass filter branch road 32 is also to be reduced to about 1/8.
In addition, should point out once more also that the present invention has more than and is limited to specific embodiment illustrated in the application apparatus of the present invention and example.That is,, also can realize various modifications and variations of the present invention according to giving advice of being comprised in the specification.
Claims (21)
1. an electrical filter is used for the filtering low frequency and is not subjected to high-voltage pulse with the protection electronic circuit,
Wherein electrical filter (1) is inserted by serial and comprises on the antenna connector (2) and a signal path between the electronic circuit (3) of a radio-frequency separator, and described electrical filter (1) comprises a high pass filter, and its cut-off frequency is lower than the minimum cutoff of the radio-frequency separator in the described electronic circuit.
2. according to the electrical filter of claim 1,
Wherein said antenna connector (2) and electronic circuit (3) are the parts of a communication unit.
3. according to the electrical filter of claim 2,
Wherein said communication unit is a mobile phone.
4. according to the electrical filter of claim 3,
Wherein said mobile phone is a single band or n frequency band mobile phone, and n=1,2,3 ...
5. according to the electrical filter of claim 3,
Wherein said mobile phone is a monotype or n pattern mobile phone, and n=1,2,3 ...
6. according to the electrical filter of claim 2,
Wherein said communication unit is a kind of cordless telephone.
7. according to the electrical filter of claim 2,
Wherein said communication unit is a kind of satellite phone.
8. according to the electrical filter of claim 2,
Wherein said communication unit is a kind of card form phone.
9. according to the described electrical filter of any one claim among the claim 3-8,
Wherein said radio-frequency separator can separate two different radio frequencies at least.
10. according to a kind of communication unit of claim 2,
The first of wherein said electronic circuit (3) is a radio-frequency signal filters or transmit/receive switch or radio frequency transmitter signal or receiver input.
11. according to the high pass filter of claim 2,
Wherein said high pass filter comprise at least one electric capacity in IEEE Std serial highway and at least one inductance in IEEE Std parallel highway.
12. according to the described high pass filter of claim 2,
Wherein said high pass filter comprise at least one electric capacity in IEEE Std serial highway and at least one resistance in IEEE Std parallel highway.
13. according to the described high pass filter of claim 2,
Wherein said high pass filter comprise at least one resistance in IEEE Std serial highway and at least one inductance in IEEE Std parallel highway.
14. according to a kind of high pass filter of claim 11-13,
Wherein said high pass filter comprises a kind of combination of the foregoing parts that are used for serial and IEEE Std parallel highway.
15. according to the high pass filter of claim 11-14,
Wherein said high pass filter is to realize on the signal path between antenna connector and the electronic circuit with discrete parts.
16. according to the high pass filter of claim 11-14,
Wherein said high pass filter is integrated in the radio-frequency separator unit as an independent multi-layer part.
17. according to the high pass filter of claim 11-14,
Wherein said high pass filter is integrated in the radio-frequency separator unit as a thin film component.
18. according to the high pass filter of claim 15 or 17,
Wherein said high pass filter and radiofrequency signal separator are made of same material.
19. according to the electrical filter of claim 11-14,
Wherein said high pass filter is that the combination with discrete parts and multi-layer part or thin film component realizes.
20. according to the electrical filter of claim 4,
Wherein the configuration of high pass filter is to have in the series via inductor is arranged in a capacitor and the IEEE Std parallel highway, and wherein the interior top element of electronic circuit is a diplexer that is used for the double frequency phone.
21. according to the electrical filter of claim 4,
Wherein the configuration of high pass filter is to have in the series via inductor is arranged in a capacitor and the IEEE Std parallel highway, and
Wherein the top parts in the electronic circuit are transmit/receive switch that are used for the double frequency phone.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99105594A EP1037308A1 (en) | 1999-03-18 | 1999-03-18 | Electric filter for filtering low frequencies |
| EP99105594.8 | 1999-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1344431A true CN1344431A (en) | 2002-04-10 |
Family
ID=8237804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00805157A Pending CN1344431A (en) | 1999-03-18 | 2000-02-24 | High-pass filter |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1037308A1 (en) |
| JP (1) | JP2002540664A (en) |
| KR (1) | KR20010113751A (en) |
| CN (1) | CN1344431A (en) |
| AU (1) | AU4102500A (en) |
| BR (1) | BR0009091A (en) |
| HK (1) | HK1045764A1 (en) |
| WO (1) | WO2000057515A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324930C (en) * | 2004-02-27 | 2007-07-04 | 联华电子股份有限公司 | Protective circuit of electrostatic discharge suitable to integrated circuit in radio frequency |
| CN102437487A (en) * | 2010-09-29 | 2012-05-02 | 微盟电子(昆山)有限公司 | Electrical connector assembly with surge isolating function |
| CN106356831A (en) * | 2016-11-04 | 2017-01-25 | 深圳市极致汇仪科技有限公司 | Device for electrostatic protection and electrostatic detection |
| CN111654255A (en) * | 2020-05-25 | 2020-09-11 | 中国电子科技集团公司第二十九研究所 | Reconfigurable ultra-wideband direct/high-pass filter circuit based on GaAs material |
| CN114498590A (en) * | 2020-11-09 | 2022-05-13 | 成都鼎桥通信技术有限公司 | Protection circuit of radio frequency device and electronic equipment |
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| JP3649111B2 (en) * | 2000-10-24 | 2005-05-18 | 株式会社村田製作所 | High frequency circuit board, high frequency module using the same, and electronic device using the same |
| DE10102201C2 (en) | 2001-01-18 | 2003-05-08 | Epcos Ag | Electrical switching module, switching module arrangement and use of the switching module and the switching module arrangement |
| FR2821993B1 (en) | 2001-03-09 | 2003-06-20 | Thomson Csf | LIGHTNING LIGHTNING PROTECTION CIRCUIT |
| JP2002290269A (en) * | 2001-03-27 | 2002-10-04 | Sanyo Electric Co Ltd | Hybrid high frequency component and information terminal employing it |
| EP1418680A4 (en) * | 2001-08-10 | 2005-04-06 | Hitachi Metals Ltd | Bypass filter; multi;band antenna switch circuit; and layered module composite part and communication device using them |
| US20040257740A1 (en) * | 2001-09-28 | 2004-12-23 | Christian Block | Circuit arrangement, switching module comprising said circuit arrangement and use of switching module |
| JP2005505188A (en) * | 2001-09-28 | 2005-02-17 | エプコス アクチエンゲゼルシャフト | Circuit device, switching module having the circuit device, and method of using the switching module |
| DE10201436B4 (en) * | 2002-01-16 | 2011-05-26 | Epcos Ag | Circuit arrangement with an antenna input and their use |
| DE10201433B4 (en) * | 2002-01-16 | 2010-04-15 | Epcos Ag | Circuit arrangement, switching module with the circuit arrangement and use of the switching module |
| DE10201434A1 (en) * | 2002-01-16 | 2004-03-04 | Epcos Ag | Antenna switching circuit for mobile telephone has antenna input coupled to electrostatic discharge protection device |
| WO2003030383A1 (en) * | 2001-09-28 | 2003-04-10 | Epcos Ag | Circuit, switching module comprising the same, and use of said switching module |
| JP4008881B2 (en) * | 2001-09-28 | 2007-11-14 | エプコス アクチエンゲゼルシャフト | Circuit device, switching module having the circuit device, and method of using the switching module |
| DE10201435B4 (en) * | 2002-01-16 | 2010-04-08 | Epcos Ag | Circuit arrangement with an antenna input |
| WO2003030385A1 (en) * | 2001-09-28 | 2003-04-10 | Epcos Ag | Circuit arrangement, switching module including said circuit arrangement and use of said switching module |
| US7492565B2 (en) | 2001-09-28 | 2009-02-17 | Epcos Ag | Bandpass filter electrostatic discharge protection device |
| DE10201438A1 (en) * | 2002-01-16 | 2003-07-24 | Epcos Ag | Antenna switching circuit for mobile telephone has antenna input and control line of switching module coupled to respective electrostatic discharge protection devices |
| EP1301017A1 (en) * | 2001-10-02 | 2003-04-09 | Sony International (Europe) GmbH | Mobile communication device with electrostatic discharge protection |
| DE10246098A1 (en) * | 2002-10-02 | 2004-04-22 | Epcos Ag | circuitry |
| DE10259035B4 (en) * | 2002-12-17 | 2015-02-26 | Epcos Ag | ESD protection component and circuit arrangement with an ESD protection component |
| JPWO2005046070A1 (en) | 2003-11-11 | 2007-05-24 | 株式会社村田製作所 | High frequency module |
| WO2006034838A1 (en) * | 2004-09-28 | 2006-04-06 | Hirschmann Car Communication Gmbh | Antenna amplifier for a vehicle with means for esd protection in the input thereof |
| DE112006001884B4 (en) * | 2005-09-12 | 2018-09-27 | Snaptrack, Inc. | Electrical component |
| JP2008167157A (en) * | 2006-12-28 | 2008-07-17 | Toko Inc | High-pass filter |
| CN101312353A (en) * | 2007-05-22 | 2008-11-26 | 宏达国际电子股份有限公司 | Radio-frequency apparatus having electrostatic protection |
| JP5635925B2 (en) * | 2011-02-24 | 2014-12-03 | 京セラ株式会社 | Communication module and in-vehicle equipment |
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1999
- 1999-03-18 EP EP99105594A patent/EP1037308A1/en not_active Withdrawn
-
2000
- 2000-02-24 BR BR0009091-3A patent/BR0009091A/en not_active Application Discontinuation
- 2000-02-24 JP JP2000607302A patent/JP2002540664A/en not_active Withdrawn
- 2000-02-24 KR KR1020017011766A patent/KR20010113751A/en not_active Application Discontinuation
- 2000-02-24 AU AU41025/00A patent/AU4102500A/en not_active Abandoned
- 2000-02-24 CN CN00805157A patent/CN1344431A/en active Pending
- 2000-02-24 WO PCT/EP2000/001494 patent/WO2000057515A1/en not_active Application Discontinuation
-
2002
- 2002-09-26 HK HK02107111.7A patent/HK1045764A1/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324930C (en) * | 2004-02-27 | 2007-07-04 | 联华电子股份有限公司 | Protective circuit of electrostatic discharge suitable to integrated circuit in radio frequency |
| CN102437487A (en) * | 2010-09-29 | 2012-05-02 | 微盟电子(昆山)有限公司 | Electrical connector assembly with surge isolating function |
| CN106356831A (en) * | 2016-11-04 | 2017-01-25 | 深圳市极致汇仪科技有限公司 | Device for electrostatic protection and electrostatic detection |
| CN111654255A (en) * | 2020-05-25 | 2020-09-11 | 中国电子科技集团公司第二十九研究所 | Reconfigurable ultra-wideband direct/high-pass filter circuit based on GaAs material |
| CN111654255B (en) * | 2020-05-25 | 2023-03-31 | 中国电子科技集团公司第二十九研究所 | Reconfigurable ultra-wideband direct/high-pass filter circuit based on GaAs material |
| CN114498590A (en) * | 2020-11-09 | 2022-05-13 | 成都鼎桥通信技术有限公司 | Protection circuit of radio frequency device and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002540664A (en) | 2002-11-26 |
| EP1037308A1 (en) | 2000-09-20 |
| KR20010113751A (en) | 2001-12-28 |
| AU4102500A (en) | 2000-10-09 |
| BR0009091A (en) | 2002-01-08 |
| HK1045764A1 (en) | 2002-12-06 |
| WO2000057515A1 (en) | 2000-09-28 |
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